Fix punctuation in it.js
Fix punctuation in it.js

Keys must match input keys exactly, and trailing colons should be preserved in the translation.
Also tweaked a couple of the comments to point to the right files
(note it's also fine to omit these comments entirely from the translation files,
as the file dist/translation-keys.txt always has up-to-date line references
as of the latest release)
asolagmbh/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,plotly/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js